Slidable block rail brake



Sept, 22, 1931. K. E. wENzEL SLIDABLE BLOCK RAIL BRAKE Filed Dec. 7,. 1929 Patented Sept. 22, 1931 rKARL ERNsTwENzEnoF HAMBoRN-oN-THE-RHINE, GERMANY sLDABLE lBLOCK 'RAIL BRAKE` l y Appui:anni mea'pcember 7, isaafseifiai No. 412,374, aan eeijmanyjoetqber 15', leas;

" @The SO-eeiiea Scotch Ybloei; Vbrakes new in use have, besides the drawbacksadherent'tol scotch blocks as a `braking means, the further disadvantage that it is not 'possible to control 5 the length" of the vbraking action after the brakinghas' set in'in such a manner as to vary the desired braking-force. In order to obtain the'desired amountof braking force the distance travelled' after the application of the 1U brake is tov be estimated already before the braking begins; After the scotch blockj has been'placedin kposition itl is not possibleanyy moreftocontrol the braking action, Since,`

n however, the intensityof :thebrakingactionf l of aV scotch blockivaries considerablyowing to luncontrollable factors .it isdesirable to.

regulate the 'amount'of the vbrakingforcedurallayY` effected braking," action.

ino#` the brakingfin accordance with n the actu# 20 f It is the object of the presentinvention to satisfy this need by controlling the" distance travelled after the application ofthe brake by lifting therwheel olf the block,' thus interrupting the braking action.

20 In order to attain this object a deformable ramp rail consisting of pivotally connected links is provided in parallelism to the main rails which inits lifted position supports the wheel flange thus relieving the slidable` block 3U of the wheel load. The lift-ing and lowering movement of said ramp rail is effected by rods and known controlling means such as distant controlled movable wedges, roller slides, excentrics or struts. Ahead of the 3"" actuating elements springs'are arranged in such a manner as to make it possible to keep the link of the ramp railwhich happens to support the aXle out of action whilst the links of the ramp rail which either are not yet 4.0 loaded or are already relievediof the load are simultaneously moved intotheir raised position by said springs and said actuating elements. This arrangement whosepurpose,

besides by the use ofsprings7 may also be 4i obtained for example .by means providing for idle movement, has the advantage that only the ramp links which'are relieved of their load are raised whereby the power necessary for operating the ramp members 50 is considerably reduced.

In the annexed drawing one embodiment ef the invention is illustrated. In'this draw-V mg y v I I p. v v K Figure ll shows'a wheel of a'track vehicle, the brake shoe inserted between said wheel andthe rail' as well as they means adapted to'regulate thebrake distance ac` c ording tothe fpresent invention in that particular 'position in which the wheel is re# tarded by thev brake shoe in the manner generally known. Figure illustrates the same arrangement in v'vhicli,` however, the means for regulating braking distance is caused to assume ay position-so lthat the retarding shoe is relieved ofthe wheel with the result that the retarding vactionis discontinued. `Figure 8 Ynally 'shows'a sectionaly view laid, in anarrangemeiitas shown in .Figure 2,.IthrO1Igh line 3-"3 of said figure, i. e. the center of the wheel at right angles tothe rail. j L 'll I Referring to said drawing, 1 'denotes the ordinary rail upon" whichthe wheel 10 of the'jtrack vehicle rolls.` In order to arrest the motion of the vehicle,` :as shownin Figure 1, a brake shoe 8 of the generally known kind is inserted between thewh'eel I0 and therail 1. "Ihe braking action of the brake f shoe-8 is lproduced by that the wheel 10,-as shown in Figure l, runs with its treadcircle upon the channel-shaped parti lying` upon. the rail of the 'brake shoe 8 and comes tc bear "against the brake-"shoe chairor bracket, brake action thus being caused by virtue of the friction between the *latter andthe wheel and by virtue of the friction set up" betlweenthe saidA brakeshoe` blade and the rail.; Vv I. l

"Now, in order to b'e able tofstop there'- tardi'ngeflect ofthe brake shoe deiinite'jpoint of they braking distance-,- remote controlled 'liftingl means are vprovided. ac-

cording to this invention 'whereby the ,wheel loading said brake' shoe is lifted clear of the same at the desired point of vthe brake'distance. s The said lifting devicelconsistsof a: deformable ramprailQ disposed parallel to the track rail andi-*formed of relatively short.l ,sections for links articulated together v meansofpivots -.Ac'tii'iglbfvaneatlieachl ofl the pivotal joints of'said ramp 2 is a wedge g 4 which by the agency of a rod system 5 actuated by hand or otherwise is adapted to v be slid horizontally forward and backward and which cooperates with a corresponding camorramp-shaped part 4 formed in the ramp-rail 2 under said pivot 3. With three successive wedges 4 occupying aposition as i illustrated on the left-hand in Figure l,

the link of said ramp rail 2 located under the wheel l0 is lowered. But. when the wedges et are caused to assume a position as illustrated in- Figures 2 andl 3 and on VVthe right-hand in Figure l by the agency of the rod system 5, the ramp rail 2 is slightly raised.V

. i The result' of thisaction, as'clearly shown in Figure 3, is lthat the wheel rim is madev to run upon theV raised ramp rail 2 so that thetread circle of the wheel is lifted above the channel-'shaped part 7 of the brake vshoe 8. Said 'latteris then relieved of theweight of n the vehicleand is further pushed or slid by as n the. wheel alongthe rail without. a braking or retarding effect taking place. y 'Since itA is Vimpossible-to lift a link of the deformable ramprail 2 by thefdisplacement of one -or two wedges 4 whenever the said link happens to be loadedby af wheel of the vehicle, the'. said wedges 4 are lslidably mounted uponjthe pull rod 5L each -between two stopsA 99 fixed on said rod, andare submitted Vto vthe action of compression springs v6, bearingfagainst the stops 9 and: tending to push said wedges towards thev stop 9. If the draw rod 5 is pulled toward the left-handvsidev'into the raised position of the ramps, then, as clearly'indicated in Figure l, Athelinks of the ramp-rail 2 notl loadedrby thewheel 10 are raised by the wedges 4,'kept against the stops 9 by the action of said springs 6, while the links of` the 'ramp rail 2 which are loaded by. the wheel l0 remain in the .lowered position due to the fact that the corresponding wedges ,lfdo noty partake of the left-hand motion of the draw rod 15, for. all that happens is that the intermediate springs 6, are compressed.

vI-Iaving'thnsdescribed my inventionwhat :I claim as newand desire to secureby Letters Patentis: v Y, l. Means topregulate the braking distance or length in track or rail vehicles which are retarded by the agency of a brake shoe interposed between wheel and rail, comprising. .a

when in raised Vposition occupying a osition adapted to be raised and lowered, said ramp rail comprising a plurality of links articu- Vlated togetherY by pivots and being capable of being raised and lowered, and which when in raised'position aresodisposed that the'wheel rim. ofI the wheel loading the brake shoe is the brake shoe is relieved. i

4;. Means to regulate'the brakedistance in rail vehicles which are retarded by the agency caused to run np on the raised link whereby.

of a brake shoe interposed between wheeland rail, comprising a deformable ramp rail parallel alongsidethe running rail and adapted to be raised and lowered, said ramp rail comprising a pluralityof links articulated together. by. pivots, Va controlling rod system wedge-shaped, pieces slidably mounted on said rods under the articulations of the links of the ramp rail'and between stops fixed on said Vdraw rods yand compression, springs pressing on onel side against sald wedges, act-A ingundereach liftable. and lowerab1e. links of the ramp r'aiLYWith theconsequence that all links of the ramp rail are raised with the eX- ception of the part thathappens to be loaded by the wheel at the time.

v Y ERNST WENZEL.

re'mote-controlled lifting device by means ol' i which the. wheel loading the brake-shoe is adapted to be liftedl clear of the brake shoe aty a definite point of the braking distance.

V2. Means to regulate the brake distance in rail vehicles which are retarde-d by the agency of. a brake shoe interposedbetween wheel andrail, comprising a ramp rail piece disposed parallel to the running rail and capable'of f i Y being raised and lowered, the said ramp rail 

